By Ted M. Knowlton, Chair
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In lots of medical or engineering purposes, the place usual differen tial equation (OOE),partial differential equation (POE), or indispensable equation (IE) types are concerned, numerical simulation is in universal use for prediction, tracking, or keep an eye on reasons. in lots of instances, even though, winning simulation of a procedure needs to be preceded by way of the answer of the so-called inverse challenge, that is frequently extra advanced: given meas ured facts and an linked theoretical version, be certain unknown para meters in that version (or unknown features to be parametrized) in this kind of approach that a few degree of the "discrepancy" among facts and version is minimum.
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Radeke, C. ; Glasser, B. ; Khinast, J. , Large-scale powder mixer simulations using massively parallel gpu architectures. Chemical Engineering Science 65, (24), 6435-6442. ; Khinast, J. G. In Granular flows - showing size effects by using high-performance simulations on gpus, Melbourne, Australia, 2009, CSIRO Australia: Melbourne, Australia. Aarons, L. , Unsteady shear of dense assemblies of cohesive granular materials under constant volume conditions. Industrial & Engineering Chemistry Research 49, (11), 5153-5165.
Note that all those tests were conducted in bubbling fluidized beds. In circulating fluidized risers, both Jiang et al.  and Tucholski and Colver  showed that the particle charge density was insensitive to the solids circulation rate and the superficial gas velocity. One likely explanation is that the increase in gas velocity and particle circulation rate promotes both charge generation and dissipation via particle-wall collisions, with the net change remaining unchanged. Fujino et al.  showed that the relative humidity has little impact on the particle charge density in bubbling fluidized beds.
EXAMPLES OF CHALLENGES THAT FCC FACES TODAY It might sound strange at first that keeping Examples of Today’s Challenges an FCC unit running, without having the unit `fall apart unexpectedly, is in fact the 1. Cyclone reliability biggest challenge today for a process that A. Erosion has been around for over 60 years. To put this in the right perspective, the average B. Corrosion run length between two scheduled 2. Emission Control – NOx reduction maintenance shutdowns for an FCC unit was about 2 years in the 1970’s/80’s, whereas the current average run length is now being stretched to between 4 to 5 years.
Proceedings of International Conference on Circulating Fluidized Beds and Fluidization Technology - CFB-10 by Ted M. Knowlton, Chair